Navitas TPN Type B Three Phase Distribution Extension Board | NTPEX-B

Three Phase Distribution Board Extension Enclosure for Commercial & Industrial Installations

The Navitas NTPEX-B Three Phase Distribution Extension Board is a premium 16-module extension enclosure designed to expand the capacity of the complete Navitas three phase distribution board range. Compatible with both the 125A and 125A/250A Hybrid Series, this versatile extension unit provides additional space for RCDs, timers, contactors, metering equipment, control gear and cable management, allowing installations to grow without compromising accessibility or appearance.

Designed for professional commercial and industrial installations, the NTPEX-B can be mounted above or below any compatible Navitas three phase distribution board, creating valuable additional wiring space while maintaining a neat, organised installation. Featuring a robust steel enclosure, removable cable entry plates, integrated DIN rail and Navitas' distinctive curved lid design, the extension board offers outstanding flexibility, durability and ease of installation.

Each enclosure undergoes a comprehensive 37-point quality inspection and is backed by a 10-year manufacturer's warranty.

Available now from Alert Electrical your Exclusive supplier of professional commercial electrical distribution equipment.

Features

• Three Phase Distribution Board Extension Enclosure
• Compatible with All Navitas Three Phase Distribution Boards
• Suitable for 125A & 125A/250A Hybrid Series
• 16 Module Capacity
• Integrated DIN Rail
• Mounts Above or Below Main Distribution Board
• Ideal for Auxiliary Control Equipment
• Perfect for Cable Management & Future Expansion
• Removable Top & Bottom Cable Entry Plates
• Reversible Door
• Lockable Enclosure (Penny Lock Compatible)
• Heavy Duty Steel Construction
• Patented Curved Lid Design
• IP30 Rated
• 10 Year Manufacturer Warranty

Expand Your Distribution System

The NTPEX-B provides additional enclosure space for expanding three phase installations while maintaining a clean, professional appearance.

Ideal for housing:

• RCDs
• Contactors
• Timers
• Energy Meters
• Control Gear
• Communication Devices
• Monitoring Equipment
• Auxiliary Electrical Components

This allows the main distribution board to remain uncluttered and easier to maintain.

Flexible Installation

The extension enclosure can be installed:

• Above the main distribution board
• Below the main distribution board

Providing installers with greater flexibility for:

• Cable routing
• Larger submains
• Multiple conduits
• Future circuit additions
• Improved cable dressing

Designed for Professional Installers

The NTPEX-B has been engineered to simplify installation by providing:

• Spacious internal layout
• Integrated DIN rail
• Removable cable entry plates
• Reversible hinged door
• Improved access for maintenance
• Cleaner cable management

The result is a safer, more organised electrical installation with unrestricted access to protective devices.

Premium Navitas Build Quality

Manufactured from premium-grade steel and finished in the same distinctive black design as the Navitas three phase distribution board range, every extension enclosure undergoes a rigorous 37-point quality control inspection to ensure exceptional reliability and long service life.

• Brand: Navitas
• Product Code: NTPEX-B
• Product Series: NTPEX Extension Series
• Product Type: Three Phase Distribution Extension Board
• Compatible With: All Navitas Three Phase Distribution Boards
• Compatible Series: 125A & 125A/250A Hybrid Range
• Module Capacity: 16 Modules
• Integrated DIN Rail: 1
• Busbar Rating: 125A
• Mounting Position: Above or Below Main Distribution Board
• Cable Entry: Top & Bottom Removable Plates
• Door Type: Reversible Steel Hinged Door
• Lockable: Yes (Penny Lock Compatible)
• IP Rating: IP30
• Material: Steel
• Finish: Black
• Cover Type: Top Side Steel Hinge (Gravity Led)
• Dimensions: 350 × 450 × 161.5mm
• Weight: 9.8kg
• Packaging: Boxed
• Standards: BS EN 61439-3, BS 7671
• Warranty: 10 Years

Ideal Applications

• Commercial Buildings
• Industrial Premises
• Manufacturing Facilities
• Plant Rooms
• Office Developments
• Retail Units
• Agricultural Installations
• Mechanical Services
• Infrastructure Projects
• Three Phase Distribution Upgrades
• Metering & Control Panels
• Electrical System Expansion

Why Buy the Navitas NTPEX-B?

The Navitas NTPEX-B provides a professional, future-proof solution for expanding three phase electrical installations. Offering additional space for control equipment, cable management and future circuits, it helps create safer, tidier and more serviceable installations. Fully compatible with the entire Navitas three phase distribution board range and backed by a 10-year warranty, it is the ideal extension enclosure for demanding commercial and industrial applications.